diff --git a/contrib/trigger_deploy.sh b/contrib/trigger_deploy.sh
index fc4a0df78..63283612a 100755
--- a/contrib/trigger_deploy.sh
+++ b/contrib/trigger_deploy.sh
@@ -4,7 +4,7 @@
 
 SSHUSER=$1
 TRIGGERVERSION=$2
-if [ -z $SSHUSER ] || [ -z TRIGGERVERSION ]; then
+if [ -z "$SSHUSER" ] || [ -z "$TRIGGERVERSION" ]; then
     echo "usage: $0 SSHUSER TRIGGERVERSION"
     echo "e.g. $0 thomasv 3.0.0"
     echo "e.g. $0 thomasv website"